Improvement in grindstone-hangers



f S. L. BIGNALL. Grindstone-Hangers.

Patented Oct. 28,1873..

wwxxes ses %W UNITED STATES PATENT OFFICE,

SOLOMQN L. BIGNALL, OF CHIGAGO, LLINOIS.

IMPROVEMENT IN GRINDSTONE'HANGERS.

Specifiatioh forming part of Letters Patent No. 143352, dated October 28, 1873; application filed i June 19, 1873. A

To all 'whom it may oca i Be it known that I, SoLoMON L. BIGNALL of Chicago, in the county of Cook and State of of Illinois, have invented an Improvement in Grindstone-Hangers, of which the following is a speoification: i

This invention consists oi' a solid pitmanshaft provided with a hearing for friction-rollers-with a collar against which one side of the grindstone bears, and with a wrought hollow shaft which is provided with a movable collar and jam-nut for holding the grindstone in place. The central part of shaft is removable from the pitnan-shaft and eXtension-shaft that the grindstone may be put on it, and that the eXtension-shaft may be removed from the other' parts when not grinding implements which require that the crank be placed at a distance from the stone, as hereinafter fully described and shown. In the drawing, Figure 1 is a longitudinal section of ny improvement i in grindstonelangers; Fig. 2, a transverse section on line :12 x, Fig. 1; Fig. 3, a section online z 2, Fig. 1.

A represents the pitman-shaft, which is provided with a short crank, B, to be used when a foot-treadle is employed, and with a hearing, C, for the ordinary anti-friction rollers to travel on in the usual manner and it is provided with an enlarged part or thimble, D, in which iscut a screw-thread to receive the screw-thread of a central shaft, E, and a collar F. One end of the shaft A is formed siX-squared, and tapered down to receive the collar Fand keep it from rotating, but the collar may be cast solid to it. The central shaft E is provided with an extended screw-thread, Gr, reaching past the jam-nat H, by means of which. difierent thicknesses of grndstones may be clam'ped between the collars I F. On the end of the extensionshaft J is fixed a thimble, K, which is provided with an internal thread to turn onto the central shaft E, and with a thread, L, to receive an ordinary crank forrotating the stone, a broken section of which is shown at M, Fig. 1. The shafts E J, in this case, are made of gaspipe, which is hollow, light, and strong, but they may be made of malleable iron. The pitman-shaft A is cast-iron, but it may be either made of wrought or malleable iron.

To use the device, the central shaft E is to be detached from the pitnan shaft A, to allow the grindstone to be put in place, as it is shown in Fig. l. The jam-nut H is then to be turned up tight,and the shafts A E are put on antifriction rollers, in the ordinary manner. The eXtension-shaft J is to be removed from shaft E when tools to be ground do not-requre the hand-crank to be considerable distance from the stone; but when scythes or other tools are 4 to be ground the eXtension-shaft J is to be used and the crank removed from the end N of shat't E and put on the end L of the shaft E.

I claim, and desire to secure by Letters Patent of the United States- The solid pitman-shaft A B, provided with a hearing, G, for the anti-friction rollers to travel on, with' a collar, F, and a removable shaft, E, which shaft supports a collar, I, and jan-nut H for hanging the stone in place, as set forth.

SOLOMON L. BIGNAI L.

XVitesses L. GLENN, C. B. SPENCER. 

